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【单选题】
实验室用锌粒与稀 H 2 SO 4 反应制取氢气时,下列措施 不能 使氢气生成速率加快的是 ( )A.
对反应体系进行加热
B.
改用 浓 H 2 SO 4
C.
滴加少量 CuSO 4 溶液
D.
不用锌粒，改用锌粉
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【单选题】我国劳动保险条例对退休待遇的年龄规定为( )
A.
男年满60岁，女职员年满55岁
B.
男年满60岁，女职员年满50岁
C.
男年满55岁，女职员年满55岁
D.
男年满60岁，女职员年满50岁
【单选题】《献血法》规定，公民自愿献血的年龄为
A.
男18至60周岁，女16至60周岁
B.
男16至60周岁，女18至60周岁
C.
男18至60周岁，女18至55周岁
D.
男18至55周岁，女18至55周岁
E.
男18至55周岁，女16至60周岁
【简答题】. This company does not ______ (区别)between men and women --- they employ and pay both equally.
【多选题】How do receptor tyrosine kinases (RTKs) activate the PI-3-kinase–Akt signaling pathway?
A.
An extracellular survival signal, such as IGF, activates an RTK, which recruits and activates PI 3-kinase. PI 3-kinase then phosphorylates an inositol phospholipid that is embedded in the cytosolic side of the plasma membrane.
B.
The resulting phosphorylated inositol phospholipid attracts intracellular signaling proteins that have a special domain that recognizes it.
C.
One of these signaling proteins, Akt, is a protein kinase that is activated at the membrane by phosphorylation mediated by two other protein kinases (here called protein kinases 1 and 2); protein kinase 1 is also recruited by the phosphorylated lipid docking sites.
D.
Once activated, Akt is released from the plasma membrane and phosphorylates various downstream proteins on specific serines and threonines.
【单选题】流线型平衡舵在舵叶上均开有由钢管构成的绳孔或在尾端上开有凹槽,其目的是__。
A.
便于系固物件
B.
便于舵拆卸与复装时吊起
C.
便于与舵承舵杆连接
D.
便于试验工作
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